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Electrochromism of 2,4 Dinitrobenzyl Pyridines as Applied to Display Devices

Publishing Venue

IBM

Related People

Hiraoka, H: AUTHOR

Abstract

2,4-dinitrobenzyl pyridine (DNBP) in both the alpha and the gamma isomeric forms, shows a marked electrochromic behavior in certain solvents such as alcoholic chloroform, dimethyl sulfoxide and so on. Presence of water and/or electrolytes in the system is not required and it can be entirely eliminated: this assures no corrosion on the surface of metal or metallic oxide electrodes, while in every other case their presence is essential.

Country

United States

Language

English (United States)

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Electrochromism of 2,4 Dinitrobenzyl Pyridines as Applied to Display
Devices

2,4-dinitrobenzyl pyridine (DNBP) in both the alpha and the gamma isomeric
forms, shows a marked electrochromic behavior in certain solvents such as
alcoholic chloroform, dimethyl sulfoxide and so on. Presence of water and/or
electrolytes in the system is not required and it can be entirely eliminated: this
assures no corrosion on the surface of metal or metallic oxide electrodes, while
in every other case their presence is essential.

In an alcoholic chloroform solution of gamma-DNBP (approx. 5% in wt) with
aluminum-aluminum electrodes, strongly blue-colored species like a blue ink
precipitates as tiny particles on the cathode surface, and tends to remain there:
this assures high resolution and no blurry images as found in some other dyes.
This blue color has a very strong contrast (G = 2.4 x 10/4/ 1 mole/-1/ cm/-1/ as
expected from related compounds; cf. H. Hiraoka et al., Bull. Chem. Soc. Japan,
39, 380 (1966)), and it can be erased by applying an opposite polarity of a same
magnitude of coloring voltage, approx. 5 volt. The coloring and erasure cycle has
been repeated many times without loss of its ability.

With a solution of gamma-DNBP in dimethyl sulfoxide(spectro grade DMSO),
some fatigue of the color intensity has been observed after several cycles of
coloring and erasure, mainly due to the oxygen dissolved in the solution: for a
long lifetime, complete elimination of the oxygen d...